Engine valve-gear.



J. D. HOOD.

ENGINE VALVE GEAR.

APPLICATION FILED 05020, 1911.

Patented Oct. 15, 1918..

2 bHEETSSHEET D l. D. HOOD.

ENGINE VALVE GEAR.

APPLICATXON FILED 050.20, 1917.

Patented 00t.15,1918. 2 SHEETS-'SHEET 2 iii ens A Winn JOHN D. HOOD, OFPHILADELPHIA, PENNSYLVANIA.

ENGINE VALVE-GEAR.

To all whom it may concern:

Be it known that 1, JOHN D. H001), a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inEngine Valve-Gears; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention has for its principal object to simplify and thus decreasethe labor and expense of constructing and installing valve gearmechanisms for locomotives; and with this general object in view, theinvention resides in the novel features of construction and uniquecombinations of parts to be hereinafter fully described and claimed, thedescriptive matter being supplemented by the accompanying drawings whichform a part of this specification and in which:

Figure l is a side elevation partly in section showing my inventionapplied;

Fig. 2 is a top plan view;

Fig. 3 is a perspective view of the im proved link mechanism; and

Fig. f is a disassembled perspective view of several features of theinvention.

In the drawings above briefly described, the numeral 1 designates one ofthe cylinders of a locomotive, 2 the piston of said cylinder, 3 thepiston rod of the piston 2, and 4: the cross head to which the rod 3 isconnected. The common steam chest 5 communicates with the cylinder inthe usual manner and a slide valve 6 is located in said chest and isprovided with an operating rod 7 preferably formed of two sectionspivoted together at 8. A. driving rod or pitman 9 is pivoted at 10 tothe cross head 4 and at 11 to one of the drivers 12, and power may betaken from this driver to the others by means of the usual connectingrods 13. The parts so far described are of common construction and needno detailed explanation.

A transverse rock shaft 14.- is mounted in suitable bearings on theframe of the locomotive and is provided on one end with a pair of crankarms 15 to which the front ends of a pair of floating members in theform of longitudinal links 16 are pivoted at 17. Fulcrumed at 18 to therear ends of the links 16, is a substantially vertical lever 19, thefulcrum being located at the upper end of this lever as shown. Asuitable distance be- Specification of Letters Patent.

Patented Oct. 15, 1918.

Application filed December 20, 1917. Serial No. 208,105.

low the fulcrum 18, the rear end of the valve rod 7 is pivoted to lever19 as shown at 20. The lower end of lever 19 is pivoted at 21 to a lever22 which is fulcrumed between its ends at 23 to the cross head 4, thepivotal connection 21 being located at the front end of said lever 22,while the rear end of said lever is pivoted at 24: to a slide 25 mountedon the pitman 9.

By the arrangement of parts above described, the lever 22 will shiftlever 19 upwardly and downwardly and at the same time will oscillatethis lever, so that the valve 6 will be operated in the required mannerwithout the provision of the usual complicated structures employed forthis purpose. The links 16 permit the necessary movement of lever 19 andwhenever rock shaft 14: is suitably shifted, the operation of parts isso changed as to either cause idling of the valve or reverse motionthereof, so that the locomotive may either be brought to a stop orreversed. The invention is extremely simple and therefore inexpensive tomanufacture, install and repair, yet it is equally as eflicient as thecomplicated arrangements of parts previously employed.

Any preferred means may be utilized for rocking shaft 14, but this shaftwill in most cases be provided with the usual crank arm 26 to which thelongitudinal reverse rod 27 is pivoted, said rod leading rearwardly tothe reverse lever in the engine cab; and due to the simplicity and easeof operation of the present invention, this lever may be of much smallersize than usual.

From the foregoing, taken in connection with the accompanying drawings,the several novel features of my invention and their advantages will bereadily understood. I wish to state, however, that although the severaldetails shown are preferably em ployed, numerous minor changes may wellbe made within the scope of the invention as claimed.

I claim:

1. In an engine valve gear, the combination of a cylinder and a pistontherein, a cross head operated by said piston and a driving rod pivotedto said cross head, a valve for said cylinder having an operating rod, alever to which said operating rod is pivoted, a floating member to whichsaid lever is fulcrumed, a second lever fulcrumed on said cross head andpivoted to said first named lever, and a sliding connection between saidsecond lever and said driving rod for operating the former from thelatter.

2. In an engine valve gear, the combina-' tion of a cylinder and apiston therein, a

\ cross head operated by said piston and a.

driving rod pivoted to said cross head, a valve for said cylinder havingan operating rod, a substantially vertical lever to which said operatingrod is pivoted near the upper end of said lever, a swinging link to oneend of which the upper end of said lever is fulcrumed, a verticallymovable support to which the other end of said link is pivoted and meansfor raising and lowering said support at the-will of the, operator, asubstantially horizontal lever fulcrumed between its ends to said cross;head, a pivotal connection between one end of said horizontal lever andthe lower end of said vertical lever, and a sliding connection betweenthe other end of said horizontal lever and said driving rod foroperating the former from the latter.

3. In an engine valve gear, the combination of a cylinder and a pistontherein, a cross head operated by said piston and a driving rod pivotedto said cross head, a valve for said cylinder and an operating rod forsaid valve, a rock shaft mounted transversely of said operating rod andhaving a pair of lateral arms straddling said rod, means for rockingsaid shaft to raise and lower said arms, a pair of vertically swinginglinks pivoted to said arms, a vertical lever fulcrumed at its upper endto said links, means connecting said valve operating rod to saidvertical lever below the fulcrum of the latter, a horizontalleverfulcrumed between its ends to said cross head, means pivotallyconnecting the front end of said horizontal lever to the lower end ofsaid vertical lever, a sliding member mounted on said driving rod, and apivotal connection between said sliding member and the, rear end of saidhorizontal lever.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOHN D. .HOOD. Witnesses:

E. A. KELLEY, H. T. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G. i

